Methodology guide
Shopping ceiling vs collar math.
Calculator
Refrigerant recovery tank calculator
Enter estimated charge in pounds. Get the 30 or 50 lb class or NO_MATCH. Uses an 80% of nominal shopping ceiling.
Result
Ceiling: 24 lb on 30-class, 40 lb on 50-class. Worked check: 18 lb → 30 lb class; 28 lb → 50 lb class.
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